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<font color='#009900'>// Copyright (C) 2017  Davis E. King (davis@dlib.net)
</font><font color='#009900'>// License: Boost Software License   See LICENSE.txt for the full license.
</font><font color='#0000FF'>#ifndef</font> DLIB_DNN_CuSOLVER_H_
<font color='#0000FF'>#define</font> DLIB_DNN_CuSOLVER_H_

<font color='#0000FF'>#ifdef</font> DLIB_USE_CUDA

<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='tensor.h.html'>tensor.h</a>"
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='cuda_errors.h.html'>cuda_errors.h</a>"
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='cuda_data_ptr.h.html'>cuda_data_ptr.h</a>"
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='../noncopyable.h.html'>../noncopyable.h</a>"

<font color='#0000FF'>namespace</font> dlib
<b>{</b>
    <font color='#0000FF'>namespace</font> cuda 
    <b>{</b>

    <font color='#009900'>// -----------------------------------------------------------------------------------
</font>
        <font color='#0000FF'>class</font> <b><a name='inv'></a>inv</b> : noncopyable
        <b>{</b>
            <font color='#009900'>/*!
                WHAT THIS OBJECT REPRESENTS
                    This is a functor for doing matrix inversion on the GPU.  The only
                    reason it's an object is to avoid the reallocation of some GPU memory
                    blocks if you want to do a bunch of matrix inversions in a row.
            !*/</font>

        <font color='#0000FF'>public</font>:

            <b><a name='inv'></a>inv</b><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>=</font> <font color='#0000FF'>default</font>;
            ~<b><a name='inv'></a>inv</b><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>;

            <font color='#0000FF'><u>void</u></font> <b><a name='operator'></a>operator</b><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>
                <font color='#0000FF'>const</font> tensor<font color='#5555FF'>&amp;</font> m,
                resizable_tensor<font color='#5555FF'>&amp;</font> out
            <font face='Lucida Console'>)</font>;
            <font color='#009900'>/*!
                requires
                    - m.size() == m.num_samples()*m.num_samples()
                      (i.e. mat(m) must be a square matrix)
                ensures
                    - out == inv(mat(m));
            !*/</font>

            <font color='#0000FF'><u>int</u></font> <b><a name='get_last_status'></a>get_last_status</b><font face='Lucida Console'>(</font>
            <font face='Lucida Console'>)</font>;
            <font color='#009900'>/*!
                ensures
                    - returns 0 if the last matrix inversion was successful and != 0
                      otherwise.
            !*/</font>

        <font color='#0000FF'>private</font>:

            <font color='#0000FF'><u>void</u></font> <b><a name='sync_if_needed'></a>sync_if_needed</b><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>;

            <font color='#0000FF'><u>bool</u></font> did_work_lately <font color='#5555FF'>=</font> <font color='#979000'>false</font>;
            resizable_tensor m;
            cuda_data_ptr<font color='#5555FF'>&lt;</font><font color='#0000FF'><u>float</u></font><font color='#5555FF'>&gt;</font> workspace;
            cuda_data_ptr<font color='#5555FF'>&lt;</font><font color='#0000FF'><u>int</u></font><font color='#5555FF'>&gt;</font> Ipiv;
            cuda_data_ptr<font color='#5555FF'>&lt;</font><font color='#0000FF'><u>int</u></font><font color='#5555FF'>&gt;</font> info;
        <b>}</b>;

    <font color='#009900'>// ------------------------------------------------------------------------------------
</font>
    <b>}</b>  
<b>}</b>

<font color='#0000FF'>#endif</font> <font color='#009900'>// DLIB_USE_CUDA
</font>
<font color='#0000FF'>#endif</font> <font color='#009900'>// DLIB_DNN_CuSOLVER_H_
</font>



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